Upgrade matplotlib to v3.11.1 (#180)

* workflows: build-matplotlib, test-matplotlib: update for v3.11.1

Copy the same patch used for 3.11.0 to 3.11.1. We don't need the pytest
backport used for 3.11.0, since that is contained in the 3.11.1 release:

|tgamblin@alchemist ~/workspace/baylibre/rise/matplotlib ((HEAD detached at v3.11.1))$ git tag --contains cf5cebedbb
|v3.11.1

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>

Author: github-actions[bot]

.github/workflows/build-matplotlib.yml

@@ -5,24 +5,24 @@ on:
   workflow_dispatch:
     inputs:
       version:
-        description: 'matplotlib version to build (git tag without leading v, e.g. 3.11.0)'
+        description: 'matplotlib version to build (git tag without leading v, e.g. 3.11.1)'
         required: true
-        default: '3.11.0'
+        default: '3.11.1'
   pull_request:
     paths:
       - '.github/workflows/build-matplotlib.yml'
       - '.github/workflows/test-matplotlib.yml'
 
 concurrency:
-  group: ${{ github.workflow }}-${{ inputs.version || '3.11.0' }}-${{ github.head_ref || github.run_id }}
+  group: ${{ github.workflow }}-${{ inputs.version || '3.11.1' }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
 permissions:
   contents: read  # to fetch code (actions/checkout)
 
 env:
   # `inputs.version` is empty on pull_request events; default there.
-  MPL_VERSION: ${{ inputs.version || '3.11.0' }}
+  MPL_VERSION: ${{ inputs.version || '3.11.1' }}
   # Query PyPI + gitlab riscv64 mirror; pick best compatible wheel
   # (`unsafe-best-match` = pip-like). Refuse sdist for dependencies so uv
   # selects the gitlab riscv64 wheel when PyPI lacks one instead of falling
@@ -33,7 +33,7 @@ env:
 
 jobs:
   build_sdist:
-    name: Build matplotlib ${{ inputs.version || '3.11.0' }} sdist
+    name: Build matplotlib ${{ inputs.version || '3.11.1' }} sdist
     runs-on: ubuntu-24.04-riscv
     permissions:
       contents: read
@@ -97,7 +97,7 @@ jobs:
 
   build_wheels:
     needs: build_sdist
-    name: Build matplotlib ${{ inputs.version || '3.11.0' }} wheels for riscv64
+    name: Build matplotlib ${{ inputs.version || '3.11.1' }} wheels for riscv64
     permissions:
       contents: read
     runs-on: ubuntu-24.04-riscv
@@ -167,7 +167,7 @@ jobs:
           if-no-files-found: error
 
   publish:
-    name: Publish matplotlib ${{ inputs.version || '3.11.0' }} to GitLab
+    name: Publish matplotlib ${{ inputs.version || '3.11.1' }} to GitLab
     needs: build_wheels
     # Only publish when the workflow was triggered from main with a specific
     # version. Manual trigger is the only entry point that reaches main;

.github/workflows/test-matplotlib.yml

@@ -5,15 +5,15 @@ on:
   workflow_dispatch:
     inputs:
       version:
-        description: 'matplotlib version to test (git tag without leading v, e.g. 3.11.0)'
+        description: 'matplotlib version to test (git tag without leading v, e.g. 3.11.1)'
         required: true
-        default: '3.11.0'
+        default: '3.11.1'
   pull_request:
     paths:
       - '.github/workflows/test-matplotlib.yml'
 
 concurrency:
-  group: ${{ github.workflow }}-${{ inputs.version || '3.11.0' }}-${{ github.head_ref || github.run_id }}
+  group: ${{ github.workflow }}-${{ inputs.version || '3.11.1' }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
 permissions:
@@ -23,7 +23,7 @@ env:
   NO_AT_BRIDGE: 1  # Necessary for GTK3 interactive test.
   OPENBLAS_NUM_THREADS: 1
   PYTHONFAULTHANDLER: 1
-  MPL_VERSION: ${{ inputs.version || '3.11.0' }}
+  MPL_VERSION: ${{ inputs.version || '3.11.1' }}
   # Query PyPI + gitlab riscv64 mirror; pick best compatible wheel
   # (`unsafe-best-match` = pip-like). Refuse sdist for dependencies so uv
   # selects the gitlab riscv64 wheel when PyPI lacks one instead of falling
@@ -36,7 +36,7 @@ jobs:
   test:
     permissions:
       contents: read
-    name: "Test matplotlib ${{ inputs.version || '3.11.0' }} — Python ${{ matrix.python-version }} on ${{ matrix.os }}"
+    name: "Test matplotlib ${{ inputs.version || '3.11.1' }} — Python ${{ matrix.python-version }} on ${{ matrix.os }}"
     runs-on: ${{ matrix.os }}
 
     strategy:

patches/matplotlib/3.11.1/0001-tests-test_font_manager-increase-test_fontcache_thre.patch

@@ -0,0 +1,34 @@
+From a830afe01625f10e11640e2b2c3f3d88b2c16b36 Mon Sep 17 00:00:00 2001
+From: Trevor Gamblin <tgamblin@baylibre.com>
+Date: Tue, 21 Jul 2026 11:25:31 -0400
+Subject: [PATCH] tests: test_font_manager: increase test_fontcache_thread_safe
+ timeout
+
+This test seems to pass in a local riscv64 container, but fails when run
+on the native runners. It's a single threading test with a 10s timeout,
+so double that timeout for our builds. For now this should be considered
+inappropriate for upstream until we see the failure on their end too.
+
+Upstream-Status: Inappropriate [native runner specific]
+
+Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
+---
+ lib/matplotlib/tests/test_font_manager.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/matplotlib/tests/test_font_manager.py b/lib/matplotlib/tests/test_font_manager.py
+index add063df90..f3a9d57039 100644
+--- a/lib/matplotlib/tests/test_font_manager.py
++++ b/lib/matplotlib/tests/test_font_manager.py
+@@ -344,7 +344,7 @@ def _test_threading():
+ def test_fontcache_thread_safe():
+     pytest.importorskip('threading')
+ 
+-    subprocess_run_helper(_test_threading, timeout=10)
++    subprocess_run_helper(_test_threading, timeout=20)
+ 
+ 
+ def test_lockfilefailure(tmp_path):
+-- 
+2.55.0
+